New 2, 3-dimethyl-1, 4-benzoquinones having an alkylthio or arylthio side chain at the 5-position and two alkylthio side chains at the 5-and 6-position were synthesized as possible antimetabolites of coenzyme Q. These compounds were tested for inhibition of coenzyme Q in mitochondrial succinoxidase and reduced nicotinamide adenine dinucleotide (NADH) -oxidase systems, and were found to show greater inhibition of the NADH-oxidase system than of the succinoxidase system. 5, 6-Di-octylthio-2, 3-dimethyl-1, 4-benzoquinone showed greater inhibitory activities than 5-alkylthio-2, 3-dimethyl-1, 4-benzoquinones. 5-Arylthio-2, 3-dimethyl-1, 4-benzoquinones showed potent inhibitory activities towards both enzyme systems.
                                    作为辅酶 Q 的可能抗代谢物,合成了新的 2,3-二甲基-1,4-苯
醌类化合物,这些化合物在 5 位有一个烷
硫基或芳基
硫基侧链,在 5 和 6 位有两个烷
硫基侧链。测试了这些化合物对线粒体琥珀氧化酶和还原型烟酰胺
腺嘌呤二核苷酸(
NADH)-氧化酶系统中辅酶 Q 的抑制作用,发现对 
NADH-氧化酶系统的抑制作用大于对琥珀氧化酶系统的抑制作用。5,6-二辛
硫基-2,3-二甲基-1,4-苯醌的抑制活性高于 5-烷
硫基-2,3-二甲基-1,4-苯醌。5-芳
硫基-2, 3-二甲基-1, 4-苯醌对这两种酶系统都有很强的抑制活性。